As winter settles across South Africa, gardens may slow down, but your indoor spaces can come alive with colour, texture, and vibrant foliage. June is the perfect time to shift your focus indoors – protecting, maintaining, and even enhancing your plant collection while preparing for the burst of spring growth ahead. With the right care, your indoor plants won’t just survive winter – they’ll thrive.

Indoor Maintenance Checklist

Fertiliser

Most indoor foliage plants enter a semi-dormant phase during winter, meaning their nutrient needs are reduced. Overfeeding can do more harm than good, so ease off on fertiliser for leafy houseplants.

However, this season is prime growing time for winter and early-spring bloomers. Bulbs like daffodils and hyacinths, as well as favourites such as cyclamen, cineraria, primula, poinsettias, chrysanthemums, and winter begonias, are actively growing and flowering now.

• Plant bulbs and flowering plants in nutrient-rich soil improved with Bio Rock.
• Feed every 4–6 weeks with Bio Ocean to support blooms and root development.
• Water consistently – every 2–3 days depending on indoor conditions.

Did you know? Feeding plants in winter helps build strong root systems, which leads to better flowering and growth in spring.

Light and Air

Light is often limited in winter, especially with shorter days and more overcast weather in many parts of South Africa.

• Place plants in bright, indirect light – harsh direct sunlight through glass can scorch leaves.
• Rotate pots weekly to maintain even growth.
• A north-facing window filtered with a sheer curtain is ideal.
• Avoid placing plants too close to cold draughts or icy window panes in colder regions like Gauteng or the Free State.

Temperature and Humidity

Many houseplants originate from tropical climates and suffer in dry, heated indoor air.

• Keep plants away from heaters, fireplaces, and air conditioners.
• Increase humidity by misting regularly, grouping plants together, or placing pots on trays of pebbles and water.
• In particularly dry Highveld winters, this step is crucial for preventing leaf browning and stress.

Watering

Watering needs drop significantly in winter. Overwatering is one of the most common causes of plant loss during this time.

• Use tepid or lukewarm water to avoid shocking roots.
• Water lightly every 7–10 days, depending on your environment.
• Always check that the top layer of soil has dried out before watering again.

Cleaning

Dust buildup is more common in winter when windows are closed. Dust blocks sunlight and reduces your plant’s ability to photosynthesise.

• Wipe leaves with a damp cloth (top and underside).
• Smaller plants can be rinsed with lukewarm water in the shower.

Tip: Clean leaves not only look better—they help plants “breathe” and grow more efficiently.

Repotting

While spring is the main repotting season, June is ideal for assessing plant health.

Watch for signs your plant needs a bigger pot:

• Roots growing out of drainage holes
• Smaller new leaves
• Soil drying out too quickly

If needed, repot into fresh, well-draining soil to give your plant a head start for spring.

Pest Control: Scale Alert

Winter indoor conditions can unfortunately create the perfect environment for pests like scale insects.

What to look for

• Small brown, tan, or oval bumps on stems and leaves
• Sticky residue (honeydew) on leaves
• Black soot-like fungus (sooty mould) developing
• Yellowing leaves and poor growth

Scale insects feed on plant sap, weakening plants over time and spreading quickly if left untreated.

How to manage scale

• Isolate affected plants immediately to prevent spread
• Remove heavily infested leaves and dispose of them (not in compost)
• For light infestations:
  • Wipe insects off with a cloth
  • Dab with alcohol using a cotton bud
• For severe infestations:
  • Apply a suitable systemic insecticide

Prevention tip: Healthy, well-fed plants in clean, humid conditions are far less susceptible to pests.

Add Life and Colour to Your Winter Garden

While outdoor growth slows, there’s still plenty you can plant for winter colour in South Africa – both indoors and in sheltered outdoor spaces.

Best plants for winter colour:

Indoors

• Cyclamen – bright pinks, reds, and whites; thrives in cool indoor conditions
• Cineraria – bold daisy-like flowers in vibrant purple, blue, and magenta
• Primula acaulis (Primrose) – cheerful winter blooms in a range of colours
• Kalanchoe – hardy succulents with long-lasting flowers
• Peace lilies – elegant white blooms with glossy green leaves
• African violets – compact plants with delicate blooms perfect for windowsills
• Cymbidium orchids – dramatic, long-lasting winter flowers

Sheltered Outdoor Colour (frost-free or mild areas like the Western Cape coast)

• Pansies & violas – classic winter bedding plants
• Snapdragons – great for vertical colour
• Calendula – bright orange and yellow winter sunshine
• Petunias (mild climates) – ongoing colour in warmer regions
• Alyssum – low-growing with sweet fragrance

Interesting fact: Many winter-flowering plants actually prefer cooler temperatures, which helps extend their blooming period compared to summer.

Make the Most of Winter

Winter is not a time to pause – it’s a time to prepare, protect, and get creative. By caring for your indoor plants, managing pests early, and adding seasonal colour, you can enjoy a vibrant, living space even on the coldest days.

Visit your local GCA Garden Centre for a wide selection of winter plants, fertilisers, and pest control solutions. And remember – healthy soil and consistent care now will reward you with a flourishing garden come spring.

Stay warm, keep growing, and grow on!